Adenosine-5{40 -carboxylic acid amides

ABSTRACT

Adenosine-5&#39;&#39;-carboxylic acid amides represented by the formula   wherein R1 and R2 are each selected from the group consisting of hydrogen, loweralkyl, lowerhaloalkyl, lowerhydroxyalkyl, lowercycloalkyl, loweralkylcycloalkyl, loweralkenyl, lowerhaloalkenyl, lowerhydroxyalkenyl, loweralkynyl, lowerhaloalkynyl, benzylamino, phenyl, loweralkylphenyl, loweralkoxyloweralkyl, substituted phenyl, 2-methylfuran or di(C1-C4)alkylamino(C1-C4)alkyl, adamantyl or R1 and R2 taken together form a 5 or 6 membered heterocyclic moiety; R3 and R4 are hydrogen or acyl, or taken together form an isopropylidene or a benzylidene group; or a pharmaceutically acceptable acid addition salt thereof.

iJnited States Patent [191 Stein et al.

[ Oct. 21, 1975 ADENOSlNE-5'-CARBOXYLIC ACID AMIDES [75] inventors: Herman Hal Stein, Skokie, lll.; Raj

Nandan Prasad, Pierrefonds,

Canada (73] Assignee: Abbott Laboratories, North Chicago, Ill.

{22] Filed: July 30, 1974 211 Appl. No.: 492,950

Related u.s. Application mi.

[60] Division of Scr. No. 370,084, June l4. i973, Pat. No. 3,864,483, which is a division oi Ser. No. 236,980, March 22, 1972, which is a continuation-in-part of Ser. No. l25,893, March 18, l97l, abandoned.

[52] US. Cl. 424/180; 260/21 1.5 R [5i] Int. Cl. A61K 27/12 [58] Field of Search 424/180; 260/21 1.5 R

[56] References Cited UNITED STATES PATENTS 3,697,504 l0/l972 Schmidt 260/2l l.5 R 3,864,483 2/l975 Stein et al 424/l80 FOREIGN PATENTS OR APPLICATIONS 2,034,785 l/i972 Germany Primary Examiner-Shep K. Rose Attorney, Agent, or Firm-Robert L. Niblack; Vincent A. Mallarc s71 ABSTRACT Adenosine-5'-carboxylic acid amides represented by the formula 1 Claim, No Drawings ADENOSINE-S'-CARBOXYLIC ACID AMIDES CROSS-REFERENCE TO RELATED APPLICATION This is a division of application Ser. No. 370,084 filed June I4, 1973 now US. Pat. No. 3,864,483 which is a divisional of application Ser. No. 236,980 filed Mar. 22, 1972, which is a continuation-in-part of application 7 Ser. No. l25,893 filed Mar. 18, 197i, now abandoned.

DETAlLED DESCRIPTION OF THE INVENTION wherein R and R, are each selected from the group consisting of hydrogen, loweralkyl, lowerhaloalkyl, lowerhydroxyalkyl, lowercycloalkyl, loweralkylcycloalkyl, loweralkenyl, lowerhaloalkenyl, lowerhydroxyalkenyl, loweralkynyl, lowerhaloalkynyl, benzylamino, phenyl,loweralkyiphenyl, loweralkoxyloweralkyl. substituted phenyl, Z-methylfuran or di(C,-C,)alkylamino(C,-C,)alkyl, adamantyl or R, and R, taken together form a or 6 membered heterocyclic moiety; R and R, are hydrogen or acyl, or taken together form an isopropylidene or a benzylidene group; or a pharmaceutically acceptable acid addition salt thereof. Compounds wherein R and R are hydrogen are useful in treating cardiovascular disorders and are particularly useful as anti-hypertensive and anti-anginal agents. A number of amides also exhibit anti-inflammatory activity.

The term ioweralkyP as used herein refers to C C, straight and branched chain alkyl groups including methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, tcrt-butyl, iso-butyl, n-pentyl, iso-pentyl, neo-pentyl, n-hcxyl, iso-hexyl and the like.

The term loweralkenyl" refers to alkenyl groups having from 2-6 carbon atoms such as vinyl, allyl, mcthallyl, l-pentenyi and the like.

The term loweralkynyl" refers to C -C alkynyl groups including ethynyl, propargyl, Z-butynyl, lpentynyl and 2-hcxynyl.

The term halo" includes chloro, fluoro, bromo and iodo.

The term "lowercycloalkyl" refers to C -C, cyclonikyl groups and includes cyclopropyl, cyclobutyi. cyclopentyl. cyelohexyl and cycloheptyl.

' The term loweralkylcycloalkyi" refers to C -C cycloalkylloweralkyi groups such as cyciopropylmethyl and the like.

The term alkoxyloweralkyl" refers to alkoxyalkyl groups having a total of no more than 6 carbon atoms such as methoxymethyl, methoxyethyl, ethoxyethyl. propoxypropyl, propoxyethyl and the like.

The term substituted phenyl" refers to a phenyl group substituted in the ortho, meta or para position by a loweralkyl, loweralkoxy or halo atom or a disubstituted phenyl group containing two of the above mentioned radicals such as 3,4-dimethoxyphenyl, 3,5- dimcthylphenyl, 3-chloro-4-methylphcnyl and the like.

The term 5 or 6 membered heterocyciic moiety" includes morphoiino, thiomorphoiino, piperidino. homopiperidino, piperazino, pyrroiidino and the like.

The term pharmaceutically acceptable acid addition salts" refers to salts prepared by reacting the amide with an organic or inorganic acid. Representative salts include hydrochloride, hydrobromide, sulfate. bisulfate, acetate, valerate, oleate, laurate, borate, benzoate, lactate, phosphate, tosylate, citrate, maleatc. succinate, tartrate. napsylate and the like.

Representative compounds of this invention include: adenosine-S'-carboxyamide; adenosine-5-(N-methyl carboxamidc; adenosine-S'-(N-iso-propyl)carboxa mide; adenosine-5'-( N-ethyi)-earboxamide; adenosine- 5'-(N-n-propyl)carboxamide; adenosine-5'-(N-isobutyl)carboxamide; adenosine-5'-(N-n-butyl)carboxamide; adenosine-5-(N-n-pentyl)carboxamide; adenosine-5'-(N-iso-pentyl)carboxamide; adenosine-5-( N,N- dimethyl)carboxamide; adenosine-S'-(N,N-diethyl)- carboxamide; adenosine-S '-(N,N-diisopropyl)carboxamide', adenosine-S-(N--methyl-N-ethyl)carboxamide; adenosine-S'-(N-cyclobutyl)-carboxamide; adenosine- 5'-(N-cyclopropylmethy'|)carboxamide; adenosine-5'- (N-propargyl)-carboxamide; adenosine-S N-allyl carboxamide; adenosine-S-(N-ethoxyethyl)carboxamide; adenosine-S'-(N,N-dicyclopropylmethyl )carboxamide; adenosine-5'-(N,N-dichloroethyl)carboxamide.

The compounds of this invention are useful as blood pressure lowering agents when administered to hypertensive patients in dosages of from .00l-25 mg./kg. of body weight daily. The compounds are also useful in the management and treatment of angina pectoris when administered to patients suffering from or prone to such attacks in dosages of from 0.001-25 mg./kg. of body weight daily. in both instances, it is preferred to administer the compounds orally, however, the compounds may also be administered via intravenous ad ministration. The compounds can be administered in single doses, however, it is preferred that they can be administered in divided doses, i.e., 3-4 times daily.

in addition to their cardiovascular activity. a number of amides exhibit anti-inflammatory activity at dosages of 0.04 to I00 mg./kg. of body weight, with a number of the compounds having an ED in the rat paw edema test of under! mgJkg.

The compounds of this invention can be prepared by converting adenosine-5'-carboxylic acid (prepared from 2',3'-isopropylidene adenosine according to the method described by Harmon et al, Chem. Ind. i969.

1141 to the corresponding acid chloride by reacting it Chicago, lllinois and the preparation thereof is well known. A number of the interntedia tesalso exhibit cardiovascular activity.

The preferred synthetic route is represented by the following reaction scheme:

on? cH The following examples further illustrate the present invention:

EXAMPLE i 2,3'-lsopropylidene Adenosine-'-Carboxylie Acid Chloride 2',3-lsopropyiidene adenosine-S'-carboxylic acid (l2.8 g.) [prepared according to the method of R. E. Harmon, et a]. Chem. Ind. London, N0. 33. 114i 1969)] was added to an excess of thionyl chloride (70 ml.) at 0C. The mixture was stirred for 1 hour at 0C. and then the temperature was allowed to go up to room temperature for another hour. The clear solution was poured, in a thin stream, onto a large volume of well stirred dry ether. The yellow precipitate of 2',3'- isopropylidene adenosine- 5-carboxylic acid chloride. m.p. l-l95 dec. was filtered and washed with an excess of dry ether. This material was used directly for the preparation of the amides without any further purification.

EXAMPLE 2 Adenosine-S '-Carboxamide A mixture of 6.8 g. of 2',3'-isopropylidene adenosine-S'warbd'trylic acid chloride and 50 ml. of liquid anhydrous ammonia was stirred for 2 hours at -60 to 50C. At the end of this time the ammonia was allowed to evaporate off at room temperature. The residue was triturated with cold aqueous sodium bicarbonate solution (lN). The resulting insoluble solid was filtered. washed with cold water and recrystallized from ethanol to yield 3.5 g. (55%) of crude 2',3'- isopropylidene adenosine-fl'-carboxamide, m.p. 220-222. The amide was then mixed with ml. of l N hydrochloric acid and maintained at a temperature of between 60-70 for 45 minutes. The acidic solution was then cooled, neutralized with sodium bicarbonate and the mixture evaporated to dryness under reduced pressure. The residue was recrystallized three times from absolute ethanol to yield one gram of pure adenosine-Scarboxamide, m.p. 245247; [a],,""' 29 1': 0.9 (c, 1.08 in IN HCl). Elemental analysis and nuclear magnetic resonance data confinned the identity of th compound.

EXAMPLE 3 Adenosine-S N-methyl )Carboxamide 2',3'-lsopropylidene adenosine-5-[ N-methylcarboxamide] (m.p. 264-265) was prepared according to the method of Example 2 from 2',3'-isopropylidene adenosine-5'-carboxylic acid chloride and an excess of dry liquid methylamine at -20 to iOC. The 2',3- isopropylidene group was cleaved by the use of 1N HCl at 60 for 45 minutes to give adenosine-5'-(N-methyi)- carboxamide in 44% yield; m. p. 240-24l; [a],,' 23 :t0.6 (c. 3.2 in iN HCl). Elemental analysis and nuclear magnetic resonance data confirmed the identity of the compound.

EXAMPLE 4 Adenosine-S '-(N,N-dimethyl )Carboxamide 13.5 g. of 2,3'-isopropylidene adenosine-5'- carboxylic acid chloride was stirred with excess dry dimethylamine at -l0 to 0C. The clear solution was allowed to warm to room temperature. in about 3 hours the unreacted dimethylamine had evaporated off. The residue was washed with ether and dissolved in the minimum amount of cold aqueous NaHCO solution (1N The basic aqueous solution so obtained was extracted five times with 50 ml. of chloroform. The chloroform extract was dried and evaporated under reduced pressure to give an amorphous solid. This solid was dissolved in dilute acetic acid, filtered (to remove a small amount of insoluble material) and the filtrate was extracted four times with 50 ml. of chloroform. The chloroform extract was dried and evaporated to dryness under reduced pressure to yield 6.0 g. (43%) of 2,3-

isopropylidene adenosine-S-(N.N-dimethyl)carboxamide. The crude amide (m.p. l06-l l0) was dissolved in 100 ml. of 1N HCl and kept at 0040" for min EXAMPLE 5 Adenoslne-S'-[(N-ethyl)-Carboxamide1 Freshly prepared 2',3'-isopropylidene adenosine-5- carboxylic acid chloride (prepared from 6.4 g. of 2',3'- isopropylidene-S'-carboxylic acid) was stirred with excess ot'dry liquid ethyl amine at to -35. The clear red-orange solution was allowed to warm up to room temperature and kept at this temperature for 15 hours. At the end of this period the excess of ethyl amine had evaporated off. The residue was triturated with cold aqueous NaHCO solution. The white precipitate was 15 nally melted at 246-247 (sharp). [a],,'

f ltered off and washed with a small amount of cold water to yield 3.1 g. (44.5%) of crude 2'.3'- isopropylidene-5'-[(N-et.hyl)-carboxamide] m.p. 225227. R 0.72 (silica gel) system: n.BuOH:-

5 H,O:NH OH (86:l4:5). The above amide was mixed with 80 ml. of l N HCl and kept at for 45 minutes. The acidic solution was then cooled and basified with NaHCo The mixture was then evaporated to dryness under reduced pressure. and the residue recrystallized l0 twice from absolute ethanol and finally from water.

The white crystalline product was dried in vacuo for 2 days over H0, at 78 to give 0.9 g. (32%) of adenosine-S'-[(N-ethyl)carboxamldelwhlch melted slowly at l36-l72 and solidified again at l48-l50 and fi- 163 (c, 0.92 in l N HCl); R5 0.5l (silica gel). System: n- BuOH:H,O:NH.OH (86:l4:05); NMR (deuterated DMSO) peaks (in ppm) at 5.6 (2'-OH. 3-OH). 7.4 (6C'NHl); 8.8 (CONH); 3.2 (CH CH Elemental compound.

The following compounds are prepared according to the method of Example 4, substituting the appropriate amine for diethylamine.

Recryltn. a Example R. R. Mp'C. Solvent Rotation C/lNHCI R, l

0 -c.H. H 240-241 ".0 --l6.3::0.54' 0.02 0.5l 1 -c.H.--o-c,|4 H l07-ll0 EtOH 4.4109 0.54 0.44

a -cH H 1:41-14: EtOH 412.2 0.223 0.55

H. 9 -(cH.).ca, H 104-100 DMF -s 0115- 0:54 0.50 lo -cH. cH-cH. a 222-224 EtOH l3.5:l.4' 0.309 0.50 n -cH,-c c H l3S-l :1 ElOH -21.5:0.5- 0.44 0.44 l2 H 249-250 EtOH 0.s=e0.s' 0.504 0.41 U -cn.-@ a 150-133 .0 -0.a:1.s' 0.3l5 055 I4 -(cn .),cH, H I25 MeOH-Aceon. I3 cH,).cH. H 220-222 MeOH-Aee- Ether cH.cn. l6 -CH\ H men-atom -|.0.+.0.a' 0.05

omen. l7 -cu.cooc.n. -110 Acatone- 41:02:- 2.10

Ether no lharp melting point -TLC was done on Eaatman 6060 Silica Gel Chromagram Sheet with Fluorelccnt indlcator. Solvent System used was:

ANALYSE Calculated Found Example Contd. Empirical Formula C H N O C H N O 0 c.,H..N.o.. 4054.0 45.42 5.40 26.48 22.68 45.10 5.07 25.5l 22.40 7 c,.H,.N. 47.73 5.72 23.05 22.70 41.49 5.05 24.05 21.0: 8 C H N.O. 46.49 3.62 26.03 l9.83 48.28 3.78 26.25 20.2l 9 C .H .N O.. MH O 3|.47 6.73 22.3l l9.2ll 3l.32 6.69 22.41 l9.l3 l0 C H N.O .H 0 46.20 3.36 24.82 23.62 46.28 3.58 24.90 24.00 H u 2 2 49.l0 4.43 26.38 20.09 4'9.i3 4.60 26.39 20.48 l2 H 2 48.79 3.83 26.22 l9.96 48.98 5.52 23.8] l9.4l l3 C lt M0. 3$.l3 4.90 22.69 l7.28 54.83 5.00 22.9! 17.71 14 C H,.N.O. 49.98 5.99 24.98 19.02 50.l2 6.06 25.l4 l9.35 l5 C H .N.O .CH,OH 47.44 6.23 23.7l 22.57 47.00 5.80 24.86 22.69 16 H N.O. 51.41 6.33 23.98 18.26 50.39 6.36 23.55 l7.36 l7 C H,.N.0. 3|.7l $.78 24.I2 [8.37 5|.3l 6.06 24.17 lli.7$

-Continued Examples Contd. R,( l) Empirical Formulae and Microanalysis Found. c. 52.21; H. 4.90; N. 20.38; 0. 20.72 23 C..H,.N,0.

Calcd. C. 50.05; H. 6.64; N. 25.84; 0. Found. C. 50.97; H. 6.8!; N. 25.93; 0. 24 0.62 C...H,..N.o.

Calcd. c. 53.33; H. 5.59; 23.32; 0. Found. c. 33.25; H. 5.77; 27.18; 0. 25 ll ll f l Calcd. C. 47.86; H. 0.02; N. 27.90. 0. Found. C. 47.68; H. 6.0l'. N. 27.9l; 0. 20 0.59 C..H..N.0.

Cnlcd. C. 30.30; H. 5.39; N. 2.3 l5: 0. 19.!0 Found. C. 50-. H. 3.02; N. 24.91; 0. 19.40 21 0.43 C.,H...N.0.(2) 2a 0.35. c..H,.N.o.(z) 29 0.5! n n Caicd. C. 50.49; H. 4.99; N. 0. Found. C. 50.38; H. 5.16; N. O- 30 c..H,,.N.0. EIOH Cnlcd. C. 50.52; H. 6.36. N. 22.09; 0. 2|.03 Found. c. 49.80; H. 6.32; N. 23.18; 0. 2|.03 3| n lo c e Calcd. C. 48.98; H. 5.14; N. 0. 24.47 Found. C. 47.96; H. 5J9; N. 0. 24.58 32 II IO I G Calcd. C. 53.33; H. 5.59. N. 23.32; 0. Found. C. 53.53; H. 5.68; N. 23.39; 0. 33 0.66 c..H,,N.0.

(3) Calcd. C. 51.72; H. 5.79; N. 24.12; 0.

Found. C. 5|.74; H. 5.82; N. 24.47; 0. 34 c.,H,.N.o.

Calcd. c. 53.33; H. 5.59; N. 23.32; 0. Found. c. 53.39; H. 5.48; N. 23.43; 0.

l. R, values are obtained from the TLC. Unless other- R. R, R. ED,u(m ./k wise specified. solvent system used was: nBuOHzN- C H H H 0 I37 HJZH: 86:5:14. All compounds had a single spot H H 5 in t e T .4 H H L28 2. The total of the percentage composition of all the CH H H 55 elements (C. H. N & 0) determined by the analyst was only 95% or less. The compounds had a single spot in the TLC. Their structures were followed by the infra- H red spectra and confirmed by the nmr. 40 I -cH,- 1 -01. H H vs 3. Solvent system: n-Butanol saturated with water. 4 am I am I l 3 While all of the compounds of this invention exhibit y y cardiovascular activity. only certain of the compounds exhibit anti-inflammatory activity. The following table summarizes the anti-inflammatory activity in the rat paw edema assay; R, is H m each of the above compounds The compounds of thils invention can be formulated into various pharmaceutically acceptable dosage forms such as tablets, capsules. pills and the like for immediate or sustained releases by combining the active com- NH pound with suitable pharmaceutically acceptable carriers or diluents according to methods well-known in the art. Such dosage forms may automatically include excipients. binders. fillers. flavoring and sweetening N agents and other therapeutically inert ingredients necessary in the formation of the desired preparation.

Preparations for parenteral administration include sterile. aqueous or non-aqueous solutions. suspensions or emulsions which are well-known in the art.

OR, OR

We claim:

I. A method of lowering blood pressure in a hypertensive mammal comprising administering to said mammal a therapeutically effective amount oi a compound of the formula 

1. A METHOD OF LOWERING BLOOD PRESSURE IN A HYPERTENSIVE MAMMAL COMPRISING ADMINISTERING TO SAID MAMMAL A THERAPEUTICALLY EFFECTIVE AMOUNT OF A COMPOUND OF THE FORMULA 